Hardy, H. R., Jr, & Stefanko, R. (1973). New horizons in rock mechanics: Proceedings of the fourteenth Symposium on rock mechanics held at the Pennsylvania State University, University Park, Pennsylvania, June 11-14, 1972. New York, NY: American Society of Civil Engineers.
Παραπομπή Chicago StyleHardy, H. Reginald, Jr, and Robert Stefanko. New Horizons in Rock Mechanics: Proceedings of the Fourteenth Symposium On Rock Mechanics Held At the Pennsylvania State University, University Park, Pennsylvania, June 11-14, 1972. New York, NY: American Society of Civil Engineers, 1973.
Παραπομπή MLAHardy, H. Reginald, Jr, and Robert Stefanko. New Horizons in Rock Mechanics: Proceedings of the Fourteenth Symposium On Rock Mechanics Held At the Pennsylvania State University, University Park, Pennsylvania, June 11-14, 1972. New York, NY: American Society of Civil Engineers, 1973.